The design of its building was a collaboration between the Chicago firm of Perkins, Wheeler and Will and Eliel and Eero Saarinen.

[5] Sebastian Hinton's prototype "jungle gym" was located here, having been moved from Horace Mann School in 1940 and then relocated to the Winnetka Historical Society in 2010.

Larry Perkins, Philip Will, Jr., and Todd Wheeler had recently formed the architectural firm and this was one of their first commissions.

Although Washburne was interested in the firm's modern approach to architecture, he was concerned about their lack of experience.

He changed his mind when Larry Perkins suggested a collaboration with Eliel and Eero Saarinen.

John McFadzean and Robert Everly were consulted to design a park-like atmosphere for the school grounds.

The one-story building is flat with the exception of a 50-foot (15 m) chimney emerging from the north face, providing a "fifth wing" stretching vertically.